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이충성,조유희,임신열,류경하,이원균 한국신뢰성학회 2023 신뢰성응용연구 Vol.23 No.4
Purpose: This study conducts reliability testing on a widely used industrial pilot check valve, adhering to the International Organization for Standardization (ISO) 19973-5 standard. The testing process identifies and reviews issues observed during the tests. Methods: ISO 19973-5, reliability testing procedures were implemented, and accelerated tests were conducted to derive acceleration factors. These tests included assessing the maximum operational frequency and conducting maximum pressure acceleration tests on the researched product. Results: The standard’s circuit definitions were unclear, prompting modifications in the test circuit and failure definitions considering the operating environment. Life tests were performed on 29 samples with varying operational frequencies and pressures. Analysis of data from 8 faulty samples revealed a shape parameter (β) of 1.69, using the common slope method. The characteristic life (θ) at normal lifespan was determined to be 14,633,538 cycles, with a pressure acceleration factor of 1.75 and a frequency acceleration factor of 0.28. Conclusion: In the current industrial sector, product defects are assessed, and defect criteria are established using standards such as ISO and Korean Standards. However, there is a recognized need to establish appropriate evaluation criteria for products by considering factors such as the operating circuit and conditions of the product.
장진,박종원,임신열,이충성,이주홍 한국신뢰성학회 2019 한국신뢰성학회 학술대회논문집 Vol.2019 No.5
미군 표준(US Military Standard) 중 하나로 1962년 최초로 발행된 MIL-STD-810은 군수품이 받는 환경 스트레스를 고려하고 이에 대한 시험 가이드를 제시하는 대표적인 환경시험 규격서로 우리나라를 포함한 여러 나라의 군과 민간분야에서 활용되고 있다. 한편, 본 규격은 군수품의 기술개발과 변화하는 사용환경, 그리고 발전된 시험기술을 반영하여 지속적으로 개정되었고 최근(2019년 1월) 새로운 버전인 MIL-STD-810H가 발간되었다. 이에 본 논문에서는 해당 규격의 여러 환경시험 중 진동시험(Method 514)의 역사와 주요 변경 내용을 살펴보고 그 안에서 최신 변경 내용의 의미를 살펴보았다. The revision of MIL-STD-810, which is environmental engineering and considerations and laboratory tests guidance of US military, has been incorporating the changing requirements and the technical advancements. Vibration test method is one of the 29 environmental test methods in the guidance and has the 25 categories separated by life phases and platforms. In this paper, major revisions to the vibration test method of MIL-STD-810H, published as revised in January 2019, were reviewed by category and compared with previous versions. In addition, the limitations of the specification by the limited experimental conditions from which specific test requirements were derived were reviewed, and the points of caution or more advanced application were considered in applying the specification compared to other standards such as DEF and AECTP.
군 특수차량용 인휠 드라이브 기어박스의 가속 내구성시험에 관한 연구
이용범,이용범,이기천,이종직,임신열,김우진,김광민 유공압건설기계학회 2022 드라이브·컨트롤 Vol.19 No.3
The in-wheel drive gearbox for military special vehicles converts the high-speed & low-torque output generated by the electric servomotor, into low-speed & high-torque mechanical power. As the vehicle is remotely maneuvered in mountainous terrain, wet fields, rough terrain, etc., the gearbox must generate a maximum input speed exceeding 5,000 rpm, a maximum torque of 245 Nm, and MTBF of 9,600 km. The purpose of this study was to analyze the failure mode of the gearbox, to ensure the durability of the in-wheel drive gearbox. Also, the field load test data of the vehicle was analyzed, the acceleration durability test standards were established, the acceleration durability test was conducted, and the durability test results were analyzed as well.
풍력발전기용 Yaw gearbox의 가속 수명시험에 관한 연구
이용범,이기천,이종직,임신열 사단법인 유공압건설기계학회 2024 드라이브·컨트롤 Vol.21 No.1
The yaw gearbox is a key device in a wind power generator that improves power generation efficiency by rotating hundreds of tons (400 to 600 tons) of nacelle so that the blade reaches 90 degrees in the wind direction. Recently, installation sites have been advancing from land to sea as they have become super-large at (8-12) MW to increase the economic feasibility of wind power generators and utilize excellent wind resources, and the target life of large wind power generators is 25 to 30 years. The yaw gearbox of 6 to 12 sets is installed in a very complex place inside the nacelle on the tower with parallels, and it is important to secure the reliability of the yaw gearbox because if a failure occurs after installation, it costs tens to hundreds of times the price of a newproduct to restore. In this study, equivalent loads were calculated by analyzing failure mode and field data, accelerated life test conditions were established, and a test device was constructed to perform the accelerated life tests and performance tests to ensure the reliability of the gearbox.
풍력발전기용 Yaw Gearbox의 가속 수명시험에 관한 연구
이용범(Yong-Bum Lee),이기천(G. C. Lee),이종직(J. J. Lee),임신열(S. Y. Lim),김우진(W. J. Kim),김광민(K. M. Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The yaw gear box of a wind power generator is a key device that rotates several hundred tons (200 to 600 tons) of nacelle so that the blade is 90 degrees in the direction of wind to improve power generation efficiency. Recently, in order to increase the economic efficiency of wind power generators and utilize excellent wind resources, the installation site is expanding from land to sea as it has become super-large to 8-12MW. The target life of large wind power generators requires more than 25 to 30 years. The yaw gearbox is installed in 6 to 12 parallels in very complex places above the tower and below the nacelle, and if a failure occurs after installation, it is important to ensure reliability of the yaw gearbox because it costs tens to hundreds of times the price of a new product as well as economic damage. In order to secure the reliability of the gear box, the equivalent load was calculated by analyzing the failure mode analysis and the Filed data, and the accelerated life test condition was established, and the test device was constructed to analyze the performance degradation.